The ornamental design for a bicycletire tread, as shown and described.
FIG. 1 is a perspective view of a bicycle tire tread showing my new design,
it being understood that the pattern is repeated uniformly throughout the
circumference of the tread as shown schematically in solid lines;
FIG. 2 is an enlarged fragmentary plan view showing the tread pattern in
greater detail;
FIG. 3 is an enlarged fragmentary side elevation view thereof; and
FIG. 4 is a transverse section view taken substantially along the line 4--4
of FIG. 3 illustrating the profile of the tire tread in greater detail.
The broken lines in the drawing are for illustrative purposes only and form
no part of the claimed design.